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Reserving Resources for Audio Coders Figure 7. Reservation State after a Subsequent Call Fails Application Device Management Interface IPML Interface dev_ReserveResourceEx(ipmH,RESOURCE_IPM_G726,RESOURCE_IPM_G729) DMEV_RESERVE_RESOURCE dev_ReserveResourceEx(ipmH,RESOURCE_IPM_AMR_NB) DMEV_RESERVE_RESOURCE_FAIL ipm_StartMedia(ipmH,G.726) IPMEV_STARTMEDIA ipm_Stop() IPMEV_STOP dev_ReleaseResourceEx(ipmH,RESOURCE_IPM_ALL_AUDIO_CODERS) DMEV_RELEASE_RESOURCE ipm_StartMedia(ipmH,G.726) IPMEV_STARTMEDIA ipm_Stop() IPMEV_STOP Application gets a re-INVITE from the remote side requesting a change of coder. Application issues call to stop the media operation. Application issues reserve for AMR-NB; operation fails for lack of available resources. G.726 and G.729 were previously reserved successfully and remain in effect. 38 Dialogic ® IP Media Library API Programming Guide and Library Reference Dialogic Corporation
8.Using the AMR-NB Audio Coder This chapter describes the AMR Narrow Band coder and how to implement this coder in an application. Topics include: Feature Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 API Library Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Sample Scenario: Transmit at Bit Rate Requested by Remote Side . . . . . . . . . . . . . . . 42 Sample Scenario: Transmit at Bit Rate Less Than Preferred Value . . . . . . . . . . . . . . . 43 8.1 Feature Description The AMR-NB audio coder is not supported on all releases. For support information, see Chapter 2, “Feature Support by Platform”. Note: Using the AMR-NB resource in connection with one or more Dialogic products does not grant the right to practice the AMR-NB standard. To seek a license patent agreement to practice the standard, contact the VoiceAge Corporation at www.voiceage.com/licensing/php. AMR is an adaptive multi-rate speech codec. During operation, both local and remote sides can request a change in the bit rate and dynamically adjust the bandwidth. The protocol uses the following: Frame Type (FT) to indicate the transmitted bit rate Codec Mode Request (CMR) value to request a particular bit rate in every packet To control the bit rate, AMR assumes that all connections are bi-directional. This feature is specific to AMR-NB. It excludes support for AMR-WB and AMR-WB+, which are wideband audio, and some other formats not addressed by AMR-NB. The AMR-NB codec supports the following bit rates: 12.2 kbps (GSM EFR) 10.2 kbps 7.95 kbps 7.40 kbps (IS-641) 6.70 kbps (PDC-EFR) 5.90 kbps 5.15 kbps 4.75 kbps Dialogic ® IP Media Library API Programming Guide and Library Reference 39 Dialogic Corporation 8
Page 1 and 2: Dialogic ® IP Media Library API Pr
Page 3 and 4: Contents Revision History . . . . .
Page 5 and 6: Contents 16 Using the Selective Pac
Page 7 and 8: Contents CT_DEVINFO - channel/time
Page 9 and 10: Figures Contents 1 IP Media Archite
Page 11 and 12: Revision History This revision hist
Page 13 and 14: Document No. Publication Date Descr
Page 19 and 20: About This Publication The followin
Page 21 and 22: 1.Product Description This chapter
Page 23 and 24: Refer to the following Global Call
Page 25 and 26: Table 1. High-Level Feature Support
Page 27 and 28: 4.State Models This chapter describ
Page 29 and 30: Event Handling ATDV_LASTERR( ) erro
Page 31 and 32: 7.Reserving Resources for Audio Cod
Page 33 and 34: 7.3 Reserve Resources for Inbound C
Page 35 and 36: Figure 5. Reserve Resources Implici
Page 37: Reserving Resources for Audio Coder
Page 41 and 42: Using the AMR-NB Audio Coder Frame
Page 43 and 44: Using the AMR-NB Audio Coder 4. Sin
Page 45 and 46: Using the AMR-NB Audio Coder ipmMed
Page 47 and 48: NBUP_PROFILE_G711ALAW64K_20MS G.711
Page 49 and 50: Using AMR-NB and G.711 Audio Over N
Page 51 and 52: 10.3 Usage Guidelines H.263 Using R
Page 53 and 54: See RFC 3558 for details of these f
Page 55 and 56: 12.2 API Library Support Configurin
Page 57 and 58: Figure 9. Half- and Full-Duplex Med
Page 59 and 60: } Configuring for Half- or Full-Dup
Page 61 and 62: 13.2 Setting DTMF Parameters This s
Page 63 and 64: IPM_PARM_INFO parmInfo; unsigned lo
Page 65 and 66: 13.2.5 Setting Receive-only RFC 283
Page 67 and 68: 14.T.38 Fax Server 14 This chapter
Page 69 and 70: Figure 13. T.38 Fax Server Call Sce
Page 71 and 72: } ipm_handle_disconnected = true; i
Page 73 and 74: } } if( sr_enbhdlr( ipm_handle, EV_
Page 75 and 76: 15.2 Implementation Guidelines Impl
Page 77 and 78: #define NUMCHAN 2 class CHANNEL //
Page 79 and 80: Implementing Native T.38 Fax Hairpi
Page 81 and 82: Implementing Native T.38 Fax Hairpi
Page 83 and 84: Using the Selective Packet Filtrati
Page 85 and 86: 17.2 QoS Alarm Types Quality of Ser
Page 87 and 88: 17.4 QoS Event Types Quality of Ser
Page 89 and 90:
Quality of Service (QoS) Alarms and
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Figure 15. QoS Scenario 2: True Ala
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Register event handler function wit
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} /* . . . . */ } Quality of Servic
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Quality of Service (QoS) Alarms and
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18.3 Implementing Volume Control Vo
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} } ipm_GetParm(nDeviceHandle, &par
Page 103 and 104:
Using Echo Cancellation With echo c
Page 105 and 106:
20.3 Example Code 1 for NAT Travers
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} } Using NAT Traversal in SIP Medi
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Using Secure RTP For encryption, th
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21.3.3 Usage Restrictions Using Sec
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Using Secure RTP QOSTYPE_SEC_MKI_NO
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21.8 Use Case for Secure RTP Figure
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} MediaInfo.MediaData[1].eMediaType
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Building Applications libpthread.so
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23.2 I/O (Input/Output) Functions T
Page 123 and 124:
Function Summary by Category Table
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ipm_Close( ) close an IP channel de
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ipm_DisableEvents( ) disable IP not
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IPMEV_ERROR Indicates that the func
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ipm_EnableEvents( ) enable IP notif
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IPMEV_ERROR Indicates that the func
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ipm_GenerateIFrame( ) generate an I
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} � See Also None. void CheckEven
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etrieve capability (for example, co
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ipm_GetCTInfo( ) return information
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ipm_GetLocalMediaInfo( ) retrieve p
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EIPM_SYSTEM System error � Exampl
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ipm_GetParm( ) retrieve the current
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} retrieve the current value of a p
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� Cautions None. � Errors retri
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ipm_GetQoSThreshold( ) retrieve QoS
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} retrieve QoS alarm threshold sett
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ipm_GetSessionInfo( ) retrieve stat
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} } /* . . Perform Error Processing
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ipm_GetSessionInfoEx( ) retrieve RT
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etrieve RTCP data for a session —
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ipm_GetXmitSlot( ) return TDM time
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} /* . . . continue . . */ return T
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� Cautions None. � Errors send
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send a response to an Nb UP invitat
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{ send a response to an Nb UP invit
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� Cautions None. � Errors send
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send an Nb UP initialization messag
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send an Nb UP initialization messag
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IPMEV_ERROR Indicates the function
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ipm_ModifyMedia( ) modify propertie
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modify properties of active media s
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} /* . . continue processing . */
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� Termination Events open an IP c
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ipm_ReceiveDigits( ) enable the IP
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} /* . . Main Processing . . */ ena
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ipm_ResetQoSAlarmStatus( ) reset Qo
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} /* . . Continue Processing . . */
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� Errors The function returns an
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} � See Also generate master and
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� Errors generate digits to the T
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ipm_SetParm( ) set value for specif
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void CheckEvent() { int nEventType
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� Cautions change QoS alarm thres
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ipm_StartMedia( ) set media propert
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EIPM_SYSTEM System error set media
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set media properties and start the
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� Cautions None � Errors stop o
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ipm_UnListen( ) stop listening to t
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} /* . . Continue processing . . */
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Events IPMEV_GET_LOCAL_MEDIA_INFO S
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Events IPMEV_SEND_DIGITS Successful
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Data Structures IPM_QOS_ALARM_DATA
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channel/time slot device informatio
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audio coder properties used in an I
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audio coder properties used in an I
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audio coder options — IPM_AUDIO_C
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IPM_CLOSE_INFO reserved for future
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IPM_ENDPOINTID_INFO endpoint ID inf
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IPM_EVENT_INFO used for IP event no
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IPM_IFRAME_INFO retrieve I-Frame in
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IPM_INIT_RECEIVED inbound IP initia
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IPM_INIT_SEND IP initialization mes
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parent of port and coder info struc
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IPM_MEDIA_INFO parent of IP_MEDIA,
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IPM_NBUP_INIT_FAILURE Nb UP protoco
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IPM_NBUP_INIT_RESPONSE response to
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IPM_NBUP_NACK_SENT NACK response to
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IPM_NBUP_PROFILE_INFO type of Nb UP
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IPM_NBUP_SUBFLOW_INFO attributes of
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IPM_PARM_INFO used to set or retrie
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used to set or retrieve parameters
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used to set or retrieve parameters
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IPM_QOS_ALARM_DATA data associated
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parent of QoS alarm data, contains
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QoS alarm threshold settings for an
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QoS alarm threshold settings for an
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IPM_RTCP_SESSION_INFO session infor
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IPM_SECURITY_BASE64_KEY Base64-enco
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IPM_SECURITY_INFO security informat
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contains security key info — IPM_
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IPM_SESSION_INFOEX RTCP data typede
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typedef enum { IPM_CRYPTO_AES_CM_12
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IPM_TELEPHONY_EVENT_INFO details of
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IPM_TELEPHONY_INFO telephony inform
Page 293 and 294:
IPM_VIDEO_CODER_INFO video coder pr
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additional video coder properties
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SC_TSINFO TDM bus (CT Bus) time slo
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Error Codes EIPM_INV_DEVNAME Invali
Page 301 and 302:
International Telecommunications Un
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